[PHP] Bump guzzlehttp/guzzle

This was requested by a user on criteo/criteo-api-marketingsolutions-php-sdk#7
on this makes sense

Author: gturri

generator/php/resources/templates/composer.mustache

@@ -25,7 +25,7 @@
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
-        "guzzlehttp/guzzle": "^7.3",
+        "guzzlehttp/guzzle": "^7.3 || ^7.10",
         "guzzlehttp/psr7": "^1.7 || ^2.0"
     },
     "require-dev": {